Gauging device



,Oct 27, v1936. v E Q ERICKSQN K 2,058,579`

GAUGING--DEVICE Filed Sept. 13, 1933 Flc.

ATTORNEY Patented Oct. 27, 1936 UNITED STATES PATENT OFFICE GAUGINGDEVICE Application September 13, 1933, Serial No. 689,223

5 Claims.

This invention relates to gauging devices of the type used for comparingthe dimensions of machine parts with respect to standard parts.

The object of this invention is to provide a 5 gauging device of thischaracter which will be simple, accurate and convenient in use.

According to this invention two motion amplifying mechanisms operate forprojecting light beams on scales provided for indicating the differenceof measurements between surfaces of a machine part with respect to astandard part. More specifically this device comprises a base forreceiving the part to be measured and an upright supporting plate formounting two independently operable motion amplifying mechanisms of thelever type pro-vided for operating a pair of mirrors for projectinglight beams onto scales placed in parallel relation to each other, therelative displacement of the light beams on the scales being Q anindication of the difference in the measurement of the machine part withrespect to the standard part and means is provided for adjusting thelight beams on the Zero positions of the scales with respect to thestandard part on the base of the machine.

Other features of the invention and advantages will appear from thefollowing description and by the claims appended thereto, referencebeing had to the accompanying drawing, in which Fig. 1 is a frontelevation View shown with portions of the housing cut away; and

Fig. 2 is a top View thereof with the casing partly shown in section.

In the drawing the numeral I0 represents a 3,; base which is formed witha recessed portion I2 and an upwardly extending plate II as shown. Onplate II is mounted a bracket I3 for attaching one end of aribbon-shaped spring I4, the other end of which is secured to the plateII as by screws 9. The spring I4 serves for pivotally mounting thedouble armed lever I5 to the lower disposed arm of which is securelyattached an anvil piece I6. The upper disposed arm of lever I5 isoperatively connected to a double armed lever Il by a ribbon-shapedspring I8 and lever II in turn is pivoted on the plate II by a flatspring I9 one end of which is secured to the bracket 56 supported byplate II, the other end being attached to platey II.

In the recessed portion I2 formed in the base I0 is mounted a pair ofbrackets 20 and 2l, best seen in Fig. 2, on which a shaft 22 isjournaled. On this shaft is mounted a sleeve 23 having at one end alever arm 24 held in operable relation with the `lower arm of lever IIby a rod 25 held in place under the tension of a spring 26 which ishooked to the lever arm I'I and arm 24 and on the other end of sleeve 23is mounted a mirror 2l which is oscillated by the movement of lever I'I,as will be hereinafter described in detail.

In the base I9 there is mounted a stud |28 which is axially adjustabletherein under the actions of nut screws I29 and |39 and in the top endof member I28 there is securely attached a ribbon-shaped spring 28 forpivoting al lever arm 29 which is operatively connected at its upper endto a double armed lever 39 by a ribbon spring 3l. Lever 39 like lever I1is pivoted on a spring 32, having one of its ends secured to the plate II and the other to a bracket 33 also secured to the plate II.

The downward extending arm of lever is operatively connected to an arm34, carried by the shaft 22, by a rod 35 held in place by a tensionspring 36. On the other end of shaft 22 there is mounted a mirror 4Iwhich is oscillated by the movement of lever arm 3i) upon the axialmovement of a rod which consists of a portion 38 threadedly engaging ananvil piece 39 of square cross-section fitted in a similarly shaped holein a lug 3l laterally extending from plate II for preventing its turningmovement upon the rotation of knob 49 as for adjusting the length ofthis rod with respect to the machine part W and the arm 29, the axialmovement of screw IZB being eifective to change the pivotal point oflever 29 with respect to rod 38 within the limits permitted by spring 3|in order to obtain the adjustment of the motion amplifying levers 29, 39and 34 with respect to the motion amplifying levers I5, Il and 24.

In the recessed portion I2 of the base I there is mounted a lamp 44 anda shield 45 provided with two adjacent and horizontally disposed slits49 and 4l for directing beams of light on the mirrors 4I and 21.

Mirrors 4I and 2l are normally set at an angle for projecting the lightbeams generated by the lamp 44 onto the zero marks of a scale having tworows of lines 48 and 49 made of translucent material and mounted on thetop of a casing 5i), this casing being secured to the mounting plate IIby a number of screws 5I threading in lugs 52 formed with the plate IIand a. plate 55 forms with the casing 50 two closed compartments C1 andC2 for the light projected onto the scales 48 and 49 by the mirrors 4Iand 2l.

On the base I9 there is mounted a fixture 53 consisting of a stationarypoint Pi and an axially movable point P2 for receiving the sprocketwheel W the spacing betw-een the teeth of which is to be compared with astandard part in a manner that will be hereinafter described in detail.

In a typical example, the measuring of a machine part with respect to astan-dard part may be as follows: An accurately formed part as, forexample, the sprocket wheel o-f a talking motion picture machine isplaced in the xture 53 as shown in Figs. l and 2 with tooth Y of thesprocket wheel engaging the anvil piece I6 of lever I5 when the beam ofY light projected by the mirror 21 illuminates the Zero mark on the rowof lines 49. The knob 4Q of rod 38 is then rotated for adjusting thelength of this roduntilits cooperating portion 39 engages the tooth Y ofthe sprocket wheel when the beam of light reflected by mirror 4Iilluminates the zero mark on the rovv of lines 48. The distance betweenthe anvil l5 and the vend of portion 39 now corresponds to an accuratelyformed wheel which is indicated by the light beams projecting on thezero mark of the scale. Under this condition a small angular movementimparted to the accurately formed sprocket Wheel W in the directionindicated by the arroW will cause the light beams to travel on the rowsof lines 43 and i9 in parallel relation to each other. The standard partW is now removed from the supporting points Pi and Pz by an outwardsliding movement of point P2 in its supporting bracket 53 against theresistance of its retractile spring shown in Fig. 2 and the part to betested is, in turn, p-laced between the points Pi and P2 with one toothplace-d for engaging the anvil piece I6 and the other tooth for engagingthe end of rod extension 39. The sprocket wheel W to be tested is thenrotated a small angular distance of about one degree as to move the rod39 and anvil I6 so that any difference in the spacing of the teeth Y andY' will cause corresponding differential movements in the operation ofthe motio-n amplifying mechanisms which difference is indicated by thespaced relation of the light beams With respect to each other on thescale. For the measurement of another set of teeth the point P2 is againmoved in a sli-ding movement in the bracket 5,3 a distance suilicient topermit the passing of .the sprocket wheel teeth on the side of anvil i6and the rod 39 and the point Pz release for engaging the sprocket wheelthrough the tension of its retractile spring, which again locate theteeth Y and Yi in line or in registry with anvil E6 and rod 39 for asubsequent testing operation.

Upon the adjustment of anvil I6 and the portion 39 of rod 3d withrespect to a standard in the comparing of a machine part, a smallangular movement of the part under test is necessary as to certain thatthe two amplifier mechanisms are in contacting relation with the part,and in case any deviation in the spacing ofthe teeth Y and Yi as in thisexample occurs, it will be indicated by the projection of the lightbeams on the rows of marks it and i9 of the scale.

It is obvious that minor changes in construction may be made in thisdevice Without departing from the spirit of the appended claims and thatthe ratio of amplification of the lever systems may be made according tothe accuracy of measurement desired.

What is claimed is:

1. A gauging device comprising a base having a mounting plate extendingperpendicularly with respect to said base, a plurality of motionamplifying means mounted on said plate, each having means forsimultaneously engaging portions of the machine part to be measured, asupport on said base upon which the machine part is movably mounted, ahousing for said amplifying means mounted on said plate, a scale carriedby said housing, a lamp, a light reilector for each of said amplifyingmeans mounted in said base adjacent to and in parallel relation to eachother, a slitted shield interposed between sai-d lamp and saidreflectors, and a plurality of parallelly disposed rows of marks on saidscale cooperating with said light reflectors for indicatingsimultaneously the movement -of each of said amplifying means inrelation to each other upon the movement of said machine part upon saidsupport, the difference in the amplitude in such movement throughmovement of said machine part, being an indication of the deviation inthe portions of the part under measurement.

2. A gauging device comprising a base having a supporting plateperpendicularly extending therefrom, means on said base for movablyreceiving the part to be measured, a plurality of cooperating motionamplifying lever mechanisms mounted on said plate each of saidmechanisms having means for engaging spaced points on the surfaces of`the part to be measured, a light projector actuated by each of saidmechanisms and a scale swept .over by the light beams of said projectorsfor indicating the relative movement of said mechanisms in terms of thedeviation between the portions of the part under measurement, theoperation of the motion amplifying lever mechanism being effected upon amovement of the part.

3. A gauging device comprising a base, a supporting plateperpendicularly extending `therefrom, means on said base for Imovablyreceiving the part to be measured, a plurality of motion amplifyingmechanisms mounted on said plate, each of said mechanisms having meansfor engaging different portions of the part to be measured, a lightprojector for each of said mechanisms, a scale having rows of marksswept over by the light beams of said projectors respectively forindicating the distance between the portions of. the machine partengaged by each of said means of said mechanisms upon a small angularmovement of said machine part. i i

4. A gauging device comprising a base having a perpendicularly extendingmounting plate, means on said base for movably receiving the part to bemeasured, a plurality of motion amplifying mechanisms pivotally mountedon said plate and having means for engaging 'different points on thesurfaces of the part to be measured, light projectors pivotally mountedon said base, ascale, parallelly disposed rows of marks on said scaleswept by the light beams of said projectors, and means for changing therelation of one of said engaging means with respect to the otherengaging means to predetermined points on said scale whereby a movementof the part under measurement is eiective to actuate said mechanisms,the relative movement of which is an indication of the deviation of themeasured part.

5. A gauging device comprising a base having a mounting plate extendingperpendicularly from said base, a bracket mounted on said plate, aribbon spring having its ends secured to said plate and said bracket, alever mounted for pivotal movement on said spring, an anvil carried atthe lower end of said lever, another bracket mounted on said plate, aribbon spring having its ends secured to the last-mentioned bracket andsaid plate, a second lever mounted for pivotal movement on the lastnamed spring, a third ribbon spring operatively connecting the adjacentends of said levers, alight reflector mounted on said base and having anarm, means operatively connecting the second-mentioned lever to saidarms for operating said reflector according to the engagement of saidanvil piece with the part to be measured, a scale for indicating such amovement, another anvil mounted for axial movement on said plate, alever mechanism mounted on said plate and operatively engaging the lastmentioned anvil, a light reector actuated by said mechanism, and meansfor indicating the relative movement of the first and second mentionedanvil upon a movement of the part under measurement for indicating thedistance between points on the surface of the part in terms of thedeviation between said points.

ELMER C. ERICKSON.

